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SYNC(2)			   Linux Programmer's Manual		       SYNC(2)

NAME
       sync - commit buffer cache to disk

SYNOPSIS
       #include <unistd.h>

       void sync(void);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       sync(): _BSD_SOURCE || _XOPEN_SOURCE >= 500

DESCRIPTION
       sync() first commits inodes to buffers, and then buffers to disk.

ERRORS
       This function is always successful.

CONFORMING TO
       SVr4, 4.3BSD, POSIX.1-2001.

NOTES
       Since glibc 2.2.2 the Linux prototype is as listed above, following the
       various standards.  In libc4, libc5, and glibc up to 2.2.1 it was  "int
       sync(void)", and sync() always returned 0.

BUGS
       According  to  the  standard specification (e.g., POSIX.1-2001), sync()
       schedules the writes, but may return before the actual writing is done.
       However,	 since	version	 1.3.20 Linux does actually wait.  (This still
       does not guarantee data integrity: modern disks have large caches.)

SEE ALSO
       bdflush(2), fdatasync(2), fsync(2), sync(8), update(8)

COLOPHON
       This page is part of release 3.22 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux				  2007-07-26			       SYNC(2)
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